EP4545758A2 - Schmiermittelfiltersystem, flugzeugtriebwerk und verfahren zum betrieb eines schmiermittelsystems - Google Patents

Schmiermittelfiltersystem, flugzeugtriebwerk und verfahren zum betrieb eines schmiermittelsystems Download PDF

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Publication number
EP4545758A2
EP4545758A2 EP24203361.1A EP24203361A EP4545758A2 EP 4545758 A2 EP4545758 A2 EP 4545758A2 EP 24203361 A EP24203361 A EP 24203361A EP 4545758 A2 EP4545758 A2 EP 4545758A2
Authority
EP
European Patent Office
Prior art keywords
conduit
lubricant
inlet
outlet
lubricant filter
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP24203361.1A
Other languages
English (en)
French (fr)
Other versions
EP4545758A3 (de
Inventor
Christophe ARSA
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Pratt and Whitney Canada Corp
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Pratt and Whitney Canada Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Pratt and Whitney Canada Corp filed Critical Pratt and Whitney Canada Corp
Publication of EP4545758A2 publication Critical patent/EP4545758A2/de
Publication of EP4545758A3 publication Critical patent/EP4545758A3/de
Pending legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M1/00—Pressure lubrication
    • F01M1/10—Lubricating systems characterised by the provision therein of lubricant venting or purifying means, e.g. of filters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H57/00—General details of gearing
    • F16H57/04—Features relating to lubrication or cooling or heating
    • F16H57/0434—Features relating to lubrication or cooling or heating relating to lubrication supply, e.g. pumps; Pressure control
    • F16H57/0435—Pressure control for supplying lubricant; Circuits or valves therefor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16N—LUBRICATING
    • F16N21/00—Conduits; Junctions; Fittings for lubrication apertures
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16N—LUBRICATING
    • F16N39/00—Arrangements for conditioning of lubricants in the lubricating system
    • F16N39/04—Arrangements for conditioning of lubricants in the lubricating system by heating
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16N—LUBRICATING
    • F16N39/00—Arrangements for conditioning of lubricants in the lubricating system
    • F16N39/06—Arrangements for conditioning of lubricants in the lubricating system by filtration
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B64—AIRCRAFT; AVIATION; COSMONAUTICS
    • B64D—EQUIPMENT FOR FITTING IN OR TO AIRCRAFT; FLIGHT SUITS; PARACHUTES; ARRANGEMENT OR MOUNTING OF POWER PLANTS OR PROPULSION TRANSMISSIONS IN AIRCRAFT
    • B64D27/00—Arrangement or mounting of power plants in aircraft; Aircraft characterised by the type or position of power plants
    • B64D27/02—Aircraft characterised by the type or position of power plants
    • B64D27/24—Aircraft characterised by the type or position of power plants using steam or spring force
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M1/00—Pressure lubrication
    • F01M1/10—Lubricating systems characterised by the provision therein of lubricant venting or purifying means, e.g. of filters
    • F01M2001/105—Lubricating systems characterised by the provision therein of lubricant venting or purifying means, e.g. of filters characterised by the layout of the purification arrangements
    • F01M2001/1057—Lubricating systems characterised by the provision therein of lubricant venting or purifying means, e.g. of filters characterised by the layout of the purification arrangements comprising a plurality of filters, parallel or serial
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M1/00—Pressure lubrication
    • F01M1/10—Lubricating systems characterised by the provision therein of lubricant venting or purifying means, e.g. of filters
    • F01M2001/105—Lubricating systems characterised by the provision therein of lubricant venting or purifying means, e.g. of filters characterised by the layout of the purification arrangements
    • F01M2001/1092—Lubricating systems characterised by the provision therein of lubricant venting or purifying means, e.g. of filters characterised by the layout of the purification arrangements comprising valves bypassing the filter
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16N—LUBRICATING
    • F16N2210/00—Applications
    • F16N2210/08—Aircraft
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16N—LUBRICATING
    • F16N2210/00—Applications
    • F16N2210/14—Bearings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16N—LUBRICATING
    • F16N2210/00—Applications
    • F16N2210/18—Electric motors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16N—LUBRICATING
    • F16N2250/00—Measuring
    • F16N2250/04—Pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16N—LUBRICATING
    • F16N2270/00—Controlling
    • F16N2270/20—Amount of lubricant
    • F16N2270/22—Amount of lubricant with restrictions
    • F16N2270/26—Amount of lubricant with restrictions variable
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16N—LUBRICATING
    • F16N2270/00—Controlling
    • F16N2270/70—Supply
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16N—LUBRICATING
    • F16N2280/00—Valves
    • F16N2280/04—Variable-flow or proportional valves

Definitions

  • the application relates generally to aircraft engines and, more particularly, to lubricant systems thereof.
  • a lubricant filter system comprising: a first lubricant filter having a first inlet and a first outlet; a second lubricant filter having a second inlet and a second outlet; an inlet conduit; a first inlet branch fluidly connecting the inlet conduit to the first inlet; a second inlet branch fluidly connecting the inlet conduit to the second inlet; an outlet conduit; a first outlet branch fluidly connecting the first outlet to the outlet conduit; a second outlet branch fluidly connecting the second outlet to the outlet conduit; a bypass conduit fluidly connecting the inlet conduit to the outlet conduit; and a bypass valve controlling fluid passage through the bypass conduit.
  • an aircraft engine comprising: a rotary assembly supported by bearings, and a lubricant system configured for circulating a lubricant to and from the bearings, the lubricant system including a lubricant filter system, the lubricant filter system having a first lubricant filter having a first inlet and a first outlet; a second lubricant filter having a second inlet and a second outlet; an inlet conduit; a first inlet branch fluidly connecting the inlet conduit to the first inlet; a second inlet branch fluidly connecting the inlet conduit to the second inlet; an outlet conduit; a first outlet branch fluidly connecting the first outlet to the outlet conduit; a second outlet branch fluidly connecting the second outlet to the outlet conduit; a bypass conduit fluidly connecting the inlet conduit to the outlet conduit; and a bypass valve controlling fluid passage through the bypass conduit.
  • a method of operating a lubricant system including: circulating a lubricant along a lubricant circuit; while circulating said lubricant, splitting the lubricant flow from an inlet conduit in two transversally outward directions relative the inlet conduit, through a first lubricant filter and a second lubricant filter, respectively, and recombining the lubricant flow in an outlet conduit; and while splitting the lubricant flow, engaging a valve member against a valve seat, the valve seat located in a bypass conduit extending between the inlet conduit and the outlet conduit, the valve member partitioning the lubricant flow in the inlet conduit from the lubricant flow in the outlet conduit.
  • Fig. 1 illustrates an example aircraft having an electric powerplant 10.
  • the electric powerplant 10 includes an electric engine 12 drivingly coupled to a load, such a rotary airfoil device 14.
  • the electric powerplant 10 is housed within a nose 16 of the aircraft and the rotary airfoil device 14 is provided in the form of a propeller 18, such as a variable-pitch propeller.
  • the electric engine 12 has a first shaft which will be referred to here as a source shaft 40 and the rotary airfoil device 14 has an output shaft 42.
  • the source shaft 40 and the output shaft 42 can form part of the drivetrain of the electric powerplant 10.
  • the source shaft 40 is coupled to the output shaft 42 via a gearbox 44 having reduction gearing and acting here as a transmission.
  • the reduction gearing is an epicyclic gearing
  • the source shaft 40 is rotatable around the same rotation axis 46 as the output shaft 42, in an in-line configuration.
  • An alternate form of transmission may be used in an alternate embodiment.
  • the electric engine 12 also has a second shaft 48 coupled to an accessory gearbox (AGB) mechanically coupled to mechanically-driven accessories.
  • AGB accessory gearbox
  • the reduction gearing can have an offset configuration, with the source shaft and the output shaft parallel but offset rather than an in-line configuration.
  • the electric engine may have a single source shaft and the mechanically-driven accessories can all be mechanically coupled to a unique gearbox.
  • the rotary airfoil device 14 may be enclosed within a ducted structure in a fan configuration.
  • the rotary airfoil device may include helicopter blades, and the output shaft may or may not be parallel to the source shaft.
  • bearing assemblies 20, such as ball bearings may be used to provide smooth relative rotation between one or more of the shafts and non-rotating components such as a casing, and/or between two shafts which rotate at different speeds.
  • a lubricant system 22 including a lubricant pump 24, sometimes referred to as a main pump, and a network of conduits and nozzles 26, can be provided to feed engine components such as the bearings 20 and/or the gearbox 44 with a lubricant such as oil.
  • seals 28 can be used to contain the oil.
  • a scavenge system 30 having cavities 32, conduits 34, and one or more scavenge pumps 36, can be used to recover the oil, which can be in the form of an oil foam at that stage, from the bearings 20.
  • the oil pump 24 draws the oil from an oil reservoir 38.
  • Air/oil separating devices (not shown) may be provided in the return line.
  • One or more lubricant filters can form part of a lubricant system and may be provided in the lubricant circulation circuit.
  • One or more lubricant filters may more specifically form part of a lubricant filter system, which can also have a bypass to circumvent a lubricant filter in the case of a blockage. The flow through the bypass can be controlled by a bypass valve.
  • the lubricant filter system can further include a pressure differential sensor configured to measure the difference in pressure between the inlet and the outlet of a filter.
  • Lubricant can also be supplied to lubricate gearing, such as a reduction gearbox 44 and/or accessory gearbox, in which case such gearboxes may be provided with a lubricant sump or with an oil reservoir.
  • Lubricant may be used not only for lubrication, but also for heat management, namely in cooling components which generate heat during operation, such as gearing (e.g. reduction gearing).
  • aircraft hybrid powerplants comprising a combination of electric and heat engines or aircraft powerplants with a heat engine only are contemplated, which may also use a lubrication system having a lubricant filter system with one or more lubricant filter.
  • a lubrication system having a lubricant filter system with one or more lubricant filter.
  • housing an engine 12 in an aircraft may be affected by engine installation constraints such as engine cowling of a narrow or otherwise limited body shape and size (which may be tied to propeller thrust efficiency, pilot visibility, and aircraft performance-drag, for instance), the presence of a cabin firewall, or a propeller plane axial position, to name some examples, which may impose particular limits in terms of dimensions or volume, in addition to other typical considerations in aviation such as cost (production and maintenance), weight, reliability, etc. While the illustrated example is but one instance of many different possible engine arrangements, many aircraft engines are affected by limited dimensions or volume in addition to other typical considerations in aviation such as cost (production and maintenance), weight, reliability, etc.
  • the lubricant filtration specification may include a flow rate specification, and may also include dimensional specifications for lubricant passages.
  • An optimal way of achieving a given lubricant filtration specification may be to include two filters.
  • a suitable way of satisfying the specification, apart from designing a new lubricant filter, may be to use two or more filters.
  • a suitable way of satisfying the specification, apart from designing a new lubricant filter may be to use two or more filters.
  • an existing model of filter which most closely matches, while satisfying, the filtration specification significantly exceeds the filtration specification such a model may impart significant excess weight and volume to the engine, and the filtration specification may be more efficiently met by two filters of a smaller model which, when combined, more closely match the filtration specification.
  • the lubricant filtration specification may be affected by the need to achieve a given flow rate of lubricant, and/or the need to use lubricant which has a given density. Higher flow rates and higher densities of lubricant typically increase the lubricant filtration specifications.
  • 15W50 oil, used in hybrid-electric propulsion is an example of high density oil which may affect the lubricant filtration specification.
  • each lubricant filter may be associated to a dedicated bypass conduit controlled by a dedicated bypass valve.
  • each lubricant filter may have a dedicated sensor.
  • the sensor can be responsible for signaling a possible malfunction of the lubricant filter, or simply to provide an measurement which can be used, for instance, in determining when preventive maintenance should be scheduled.
  • An example of such a sensor can be a pressure differential sensor responsible for measuring the pressure drop between the inlet and the outlet of a given one of the lubricant filters for instance. Including all these components (bypass conduits, bypass valves, sensors) can impart a certain amount of weight, dimensions, volume and/or cost, any and potentially all of which may be desired to be limited.
  • Figs. 2 to 4 present an example lubricant filter system 50 embodying an alternate way of introducing more than one lubricant filter.
  • an alternate way of introducing lubricant filters may allow the sharing of one or more of a bypass (valve and conduit) and a sensor between the lubricant filters, which may allow an initial cost reduction, a maintenance-related cost reduction, and/or a weight reduction, for instance, depending on the exact embodiment.
  • such an alternate way of introducing two lubricant filters may allow reducing the footprint of the lubricant filter subsystem, such as by reducing the volume, satisfying one or more dimensional specification, and/or satisfying a specification pertaining to a geometry of available space for lubricant filters.
  • the lubricant filter system 50 can have a first lubricant filter 52 and a second lubricant filter 54.
  • the expressions first and second are used here arbitrarily as labels, simply to allow distinguishing one from the other.
  • the two lubricant filters 52, 54 can be identical or different.
  • the lubricant filter system 50 can have an inlet conduit 56 and an outlet conduit 58, both of which may be common to both the first lubricant filter 52 and the second lubricant filter 54.
  • the first lubricant filter 52 has a first inlet 60 and a first outlet 62
  • the second lubricant filter 54 has a second inlet 64 and a second outlet 66.
  • a first inlet branch 68 fluidly connects the inlet conduit 56 to the first inlet 60
  • a second inlet branch 70 fluidly connects the inlet conduit 56 to the second inlet 64.
  • a first outlet branch 72 fluidly connects the first outlet 62 to the outlet conduit 58 and a second outlet branch 74 fluidly connects the second outlet 66 to the outlet conduit 58.
  • the inlet conduit 56 and the outlet conduit 58 are straight, oriented parallel to one another, though offset from one another, and the first outlet branch 72, second outlet branch 74, first inlet branch 68 and second inlet branch 70 extend transversally to the orientation of the inlet conduit 56 and of the outlet conduit 58.
  • the first inlet branch 68 extends obliquely relative the first outlet branch 72, and is longitudinally offset therefrom
  • the second inlet branch 70 extends obliquely relative the second outlet branch 74, and is longitudinally offset therefrom.
  • the lubricant filter system 50 further has a bypass conduit 76 fluidly connecting the inlet conduit 56 to the outlet conduit 58.
  • the bypass conduit 76 is closed by a bypass valve 78, present in Fig. 3 , forcing the lubricant through both filters 52, 54 via the inlet and outlet branches 68, 70, 72, 74.
  • the bypass valve 78 has a valve member 80 and the bypass valve 78 has a valve body or stem extending across the outlet conduit 58.
  • the bypass conduit 76 has a valve seat 82.
  • the bypass valve 78 has a valve member 80, and more specifically a disk in the illustrated embodiment, which can be biased against the valve seat 82.
  • valve member 80 can be spring-biased, for instance, and the force of the bias can be calibrated in a manner for the valve member 80 to yield against the pressure differential between the inlet conduit 56 and the outlet conduit 58 when the pressure differential exceeds a given threshold value.
  • the valve member 80 can be actively controlled such as, for instance, based on a measurement of the pressure differential between the inlet conduit 56 and the outlet conduit 58, in which case the valve member 80 can be controlled to retract into the outlet conduit 58, allowing fluid flow through the bypass conduit 76, when the pressure differential measurement reaches or exceeds a given threshold value.
  • Various alternative designs are possible in different embodiments, in view of different contexts and applications.
  • the first lubricant filter 52 and the second lubricant filter 54 are oriented transversally to the inlet conduit 56 and to the outlet conduit 58.
  • the first lubricant filter 52 and the second lubricant filter 54 are oriented partially opposite from one another.
  • the inlet conduit 56 and the outlet conduit 58 are both located between the first lubricant filter 52 and the second lubricant filter 54.
  • each one of the inlet conduit 56, outlet conduit 58, first inlet branch 68, first outlet branch 72, second inlet branch 70, second outlet branch 74, and bypass conduit 76 are defined in a unitary component (e.g., a solid block of material) which will be referred to herein as a manifold 84.
  • the manifold 84 generally has a triangular prism shape, with three transversal faces 86 connecting two end faces 88.
  • the three transversal faces 86 were made rectangular and the two end faces 88 were made triangular, and more specifically equilateral triangular, though it will be understood that many variants may be embodied as alternatives.
  • the first lubricant filter 52 is mounted to a first one of the transversal faces 86
  • the second lubricant filter 54 is mounted to a second one of the transversal faces 86 to form a V-shaped filtration unit as best shown in Fig. 2 .
  • the inlet conduit 56 extends into the manifold 84 from a first one of the two end faces 88
  • the outlet conduit 58 extends into the manifold 84 from a second one of the two end faces 88.
  • Such an geometrical configuration may be useful in some embodiments, such as to allow the fitting of the lubricant filter system 50 into a predefined space having geometrical and volumetric limitations.
  • the manifold 84 may have a rectangular prism shape, and the first lubricant filter 52 and the second lubricant filter 54 may be mounted to two opposite ones of four transversal faces, or two orthogonal ones of four transversal faces for instance.
  • the inlet conduit 56 and the outlet conduit 58 are parallel, but offset from one another, and have a partially overlapping length at a location corresponding to the position of the bypass conduit 76.
  • Such an arrangement can be convenient if the manifold 84 is to be manufactured by machining, for instance.
  • the inlet conduit 56 can be formed by drilling into a first end face 88
  • the outlet conduit 58 can be formed by drilling into a second end face 88
  • the bypass conduit 76 together with a valve socket 90 and the valve seat 82, can be formed by drilling or boring transversally across the manifold 84, through the outlet conduit 58, normal to the orientation of both the inlet conduit 56 and the outlet conduit 58.
  • inlet branches 68, 70 and outlet branches 72, 74 can be machined by drilling transversally from the external faces of the manifold 84 to the respective conduits 56, 58.
  • the latter arrangement can be further convenient in that it may facilitate the drilling of two pressure sensing conduits 92, 94, respectively connecting a corresponding one of the inlet conduit 56 and outlet conduit 58 to a sensor socket 96.
  • a first pressure sensing conduit 92 can be machined by drilling a narrow hole into the end of the inlet conduit 56, reaching the sensor socket 96
  • a second pressure sensing conduit 94 can be machined by drilling a thin hole into the end of the sensor socket 96, reaching the outlet conduit 58.
  • the sensor socket 96 can be adapted to receiving a sensor 98 which can have a first sensing port fluidly connected to the first pressure sensing conduit 92, and a second sensing port fluidly connected to the second pressure sensing conduit 94.
  • the sensor 98 can be configured to measure a pressure difference between the two ports, and thus adapted to measure the pressure difference between the inlet conduit 56 and the outlet conduit 58 when received in the sensor socket 96, during operation of the engine. Accordingly, the sensor 98 can be a pressure differential sensor.
  • conduits and sockets presented in the illustrated embodiment may indeed be convenient in some embodiments, various alternatives may be used in alternate embodiments, particularly if a designer is not concerned by simplifying the design or optimizing it for machining for instance.
  • the inlet conduit and the outlet conduit may be somewhat oblique from one another rather than being parallel.
  • the inlet conduit and the outlet conduit both have the same fluid direction in the illustrated embodiment, and therefore extend into the manifold from opposite end faces, in an alternate embodiment, the inlet conduit and the outlet conduit may have opposite fluid directions and extend into the manifold from a same end face, for instance.
  • bypass conduit 176 may be embodied as a linear extension to the inlet conduit 156, and the valve orientation may be aligned with an axis of the inlet and bypass conduits 156, 176.
  • Fig. 5 Another potential example is presented in Fig.
  • valve 278 having a valve member 280 which can be moved between an obstructing position in the bypass conduit 276, between the ends of the inlet conduit 256 and the outlet conduit 258, and a flow position (shown in dashed lines) where it unblocks the bypass conduit 276 to allow flow between the inlet conduit 256 and the outlet conduit 258.
  • Fig. 7 presents an example method of operating a lubricant system 700.
  • the example method includes circulating 710 a lubricant along a lubricant circuit.
  • the example method includes splitting 720 the lubricant flow from an inlet conduit in two transversally outward directions relative the inlet conduit, through a first lubricant filter and a second lubricant filter, respectively, and recombining the lubricant flow in an outlet conduit.
  • the example method can include closing 725 the bypass conduit when the pressure difference between the lubricant in the inlet conduit and the lubricant in the outlet conduit is below a pressure differential threshold, and opening 730 the bypass conduit when the pressure difference between the lubricant in the inlet conduit and the lubricant in the outlet conduit is at or above the pressure differential threshold.
  • the example method can include controlling the position of a valve member relative a valve seat, the valve seat located in a bypass conduit extending between the inlet conduit and the outlet conduit, the valve member partitioning the lubricant flow in the inlet conduit from the lubricant flow in the outlet conduit when engaged with the valve seat.
  • the steps of circulating 710, splitting 720, and either one of closing 725 and opening 730 the bypass conduit can be performed at a same time.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Lubrication Details And Ventilation Of Internal Combustion Engines (AREA)
  • Lubrication Of Internal Combustion Engines (AREA)
EP24203361.1A 2023-09-29 2024-09-27 Schmiermittelfiltersystem, flugzeugtriebwerk und verfahren zum betrieb eines schmiermittelsystems Pending EP4545758A3 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US18/374,726 US20250109701A1 (en) 2023-09-29 2023-09-29 Lubricant filter system, aircraft engine, and method of operating a lubricant system

Publications (2)

Publication Number Publication Date
EP4545758A2 true EP4545758A2 (de) 2025-04-30
EP4545758A3 EP4545758A3 (de) 2025-10-29

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EP24203361.1A Pending EP4545758A3 (de) 2023-09-29 2024-09-27 Schmiermittelfiltersystem, flugzeugtriebwerk und verfahren zum betrieb eines schmiermittelsystems

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US (1) US20250109701A1 (de)
EP (1) EP4545758A3 (de)
CA (1) CA3254711A1 (de)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20250361820A1 (en) * 2024-05-24 2025-11-27 Pratt & Whitney Canada Corp. Engine oil system for an aircraft propulsion system

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5121599A (en) * 1991-02-21 1992-06-16 United Technologies Corporation Oil filtration system and method
US20030127384A1 (en) * 2002-01-09 2003-07-10 Desh Kapur Filter module for aircraft lubrication systems
US20110147322A1 (en) * 2009-12-17 2011-06-23 Honeywell International Inc. Lubricant supply filtration system and method
US11154799B2 (en) * 2019-08-29 2021-10-26 Raytheon Technologies Corporation Dual bypass filter cascade

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CA3254711A1 (en) 2025-06-02
US20250109701A1 (en) 2025-04-03

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